LXR linux/arch/arm/mm/mm.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifdef CONFIG_MMU
   3#include <linux/list.h>
   4#include <linux/vmalloc.h>
   5
   6#include <asm/pgtable.h>
   7
   8/* the upper-most page table pointer */
   9extern pmd_t *top_pmd;
  10
  11/*
  12 * 0xffff8000 to 0xffffffff is reserved for any ARM architecture
  13 * specific hacks for copying pages efficiently, while 0xffff4000
  14 * is reserved for VIPT aliasing flushing by generic code.
  15 *
  16 * Note that we don't allow VIPT aliasing caches with SMP.
  17 */
  18#define COPYPAGE_MINICACHE      0xffff8000
  19#define COPYPAGE_V6_FROM        0xffff8000
  20#define COPYPAGE_V6_TO          0xffffc000
  21/* PFN alias flushing, for VIPT caches */
  22#define FLUSH_ALIAS_START       0xffff4000
  23
  24static inline void set_top_pte(unsigned long va, pte_t pte)
  25{
  26        pte_t *ptep = pte_offset_kernel(top_pmd, va);
  27        set_pte_ext(ptep, pte, 0);
  28        local_flush_tlb_kernel_page(va);
  29}
  30
  31static inline pte_t get_top_pte(unsigned long va)
  32{
  33        pte_t *ptep = pte_offset_kernel(top_pmd, va);
  34        return *ptep;
  35}
  36
  37static inline pmd_t *pmd_off_k(unsigned long virt)
  38{
  39        return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
  40}
  41
  42struct mem_type {
  43        pteval_t prot_pte;
  44        pteval_t prot_pte_s2;
  45        pmdval_t prot_l1;
  46        pmdval_t prot_sect;
  47        unsigned int domain;
  48};
  49
  50const struct mem_type *get_mem_type(unsigned int type);
  51
  52extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
  53
  54/*
  55 * ARM specific vm_struct->flags bits.
  56 */
  57
  58/* (super)section-mapped I/O regions used by ioremap()/iounmap() */
  59#define VM_ARM_SECTION_MAPPING  0x80000000
  60
  61/* permanent static mappings from iotable_init() */
  62#define VM_ARM_STATIC_MAPPING   0x40000000
  63
  64/* empty mapping */
  65#define VM_ARM_EMPTY_MAPPING    0x20000000
  66
  67/* mapping type (attributes) for permanent static mappings */
  68#define VM_ARM_MTYPE(mt)                ((mt) << 20)
  69#define VM_ARM_MTYPE_MASK       (0x1f << 20)
  70
  71/* consistent regions used by dma_alloc_attrs() */
  72#define VM_ARM_DMA_CONSISTENT   0x20000000
  73
  74
  75struct static_vm {
  76        struct vm_struct vm;
  77        struct list_head list;
  78};
  79
  80extern struct list_head static_vmlist;
  81extern struct static_vm *find_static_vm_vaddr(void *vaddr);
  82extern __init void add_static_vm_early(struct static_vm *svm);
  83
  84#endif
  85
  86#ifdef CONFIG_ZONE_DMA
  87extern phys_addr_t arm_dma_limit;
  88extern unsigned long arm_dma_pfn_limit;
  89#else
  90#define arm_dma_limit ((phys_addr_t)~0)
  91#define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT)
  92#endif
  93
  94extern phys_addr_t arm_lowmem_limit;
  95
  96void __init bootmem_init(void);
  97void arm_mm_memblock_reserve(void);
  98void dma_contiguous_remap(void);
  99
 100unsigned long __clear_cr(unsigned long mask);
 101